When accumulated in fish, histamine will often be found to accumulate in one side or
another of the fish but not usually both. By including both sides of the fish, your firm
risks diluting the concentration detectable in the test aliquot by half. Consequently,
the critical limit should be half that which is used when the sample derives from only
one side of the fish. For example, your firm 's 30 ppm critical limit should more
appropriately be 15 ppm when the sample is taken from both sides of the fish
(similarly a composite of 3 fish from which muscle is extracted from both sides of the
fish should more appropriately be 5 ppm histamine, rather than 10, to cause a
deviation).
The alternative is to take the sample from only one side of the fish. The risk in this
approach is that a heavier concentration of histamine on the other side of the fish
would go undetected altogether. Still, this may be the more desirable approach when
working with larger fish like tuna as part of a routine HACCP monitoring program.
Attached is a schematic of FDA's recommended sampling location on the fish for
histamine testing (see Attachment A).
When accumulated in fish, histamine will often be found to accumulate in one side oranother of the fish but not usually both. By including both sides of the fish, your firmrisks diluting the concentration detectable in the test aliquot by half. Consequently,the critical limit should be half that which is used when the sample derives from onlyone side of the fish. For example, your firm 's 30 ppm critical limit should moreappropriately be 15 ppm when the sample is taken from both sides of the fish(similarly a composite of 3 fish from which muscle is extracted from both sides of thefish should more appropriately be 5 ppm histamine, rather than 10, to cause adeviation).The alternative is to take the sample from only one side of the fish. The risk in thisapproach is that a heavier concentration of histamine on the other side of the fishwould go undetected altogether. Still, this may be the more desirable approach whenworking with larger fish like tuna as part of a routine HACCP monitoring program.Attached is a schematic of FDA's recommended sampling location on the fish forhistamine testing (see Attachment A).
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